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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク pentagonal gyrobicupola ： ウィキペディア英語版 pentagonal gyrobicupola In geometry, the pentagonal gyrobicupola is one of the Johnson solids (''J''31). Like the pentagonal orthobicupola (''J''30), it can be obtained by joining two pentagonal cupolae (''J''5) along their bases. The difference is that in this solid, the two halves are rotated 36 degrees with respect to one another. The ''pentagonal gyrobicupola'' is the third in an infinite set of gyrobicupolae. The pentagonal gyrobicupola is what you get when you take a rhombicosidodecahedron, chop out the middle parabidiminished rhombicosidodecahedron (''J''80), and paste the two opposing cupolae back together. ==Formulae== The following formulae for volume and surface area can be used if all faces are regular, with edge length ''a'':〔Stephen Wolfram, "(Pentagonal gyrobicupola )" from Wolfram Alpha. Retrieved July 24, 2010.〕 $V=\backslash frac(5+4\backslash sqrt)a^3\backslash approx4.64809...a^3$ $A=(10+\backslash sqrt(10+\backslash sqrt+\backslash sqrt)a^2\backslash approx17.7711...a^2$ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pentagonal gyrobicupola」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.